Hello, can I make a paste for my hair containing Bhringraj, Brahmi, and Organic Aloe Vera? I want to use these as an after shampoo treatment. Is it possible to add the paste to my conditioner? How do I do this? Thank you

Today was wash day after my henna treatment. I washed my hair and my daughter's hair with Henna Sooq's Cocoveda Shampoo Bar. Then I made a paste consisting of 2tbs of Neem, Bhringraj, Brahmi, Shikakai, Cassia, Amla, Aloe Vera, and coconut oil. I mixed it all with hot water and let it sit for 30 minutes. After we washed our hair, I applied the paste. I forgot to mention we added vanilla and rosemary essential oils. We left the paste on for 3 hours. It took a tub full of water to rinse out of my daughter's hair. I rinsed mine out in the shower with conditioner. Our hair was much stronger and we did not comb out much hair at all. I know this is very beneficial for our hair. I also know this is something that has to be done on a weekend because it takes a long time. What I'd like to know is how often I should do this conditioning treatment. I'm storing all my powders in the refridgerator. Is that recommended?